Sundance Improvement Association, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 4.3 ppb (monitoring period 2023-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Sundance Improvement Association
Sundance Improvement Association serves about 100 people through 26 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Benton County, Washington. EPA system ID: WA5385209. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2019 (4.5 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sundance Improvement Association is 8.4 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 4.3 ppb |
| 2019 | 4.5 ppb |
| 2016 | 8.4 ppb |
How Sundance Improvement Association compares
Of the 2,218 Washington systems with a lead result, the median latest reading is 1 ppb; 18 are over 15 ppb right now and 62 have gone over at some point. Sundance Improvement Association's 4.3 ppb sits at the 89th percentile in Washington and the 89th nationally (higher means more lead).
Other water systems in Benton County
42 other systems share Benton County; 2 of them have a higher latest lead result than Sundance Improvement Association. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Kennewick City Of | 118,164 | 0 (not detected) |
| Richland City Of | 106,499 | 2.4 ppb |
| West Richland City Of | 21,231 | 0 (not detected) |
| Prosser City Of | 8,030 | 0 (not detected) |
| Benton City Water | 5,626 | 0 (not detected) |
| Badger Mountain Irrigation District | 2,331 | 2.8 ppb |
| Summit View Water System | 1,869 | 0 (not detected) |
| Bc Water Co | 1,262 | 0 (not detected) |
| Community Sewer And Water District | 1,200 | 0 (not detected) |
| Oasis Water Corporation | 556 | 0 (not detected) |
Next steps for Kennewick, WA
Test your own tap with a certified lab first-draw sample; Kennewick, WA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Sundance Improvement Association whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.